fixes #832 - adds parameterized class support

Credits:
This patch is based on the original work of Olivier Favre
<olivier@yakaz.com> many many thanks!

• import class parameters, and try to understand their types
• support a complex matrix of environments, puppet classes and their...

fixed deprecation warning.

ensure yaml UI output is formatted correctly

fixes #1847 Ensure main and Settings aren't shown on the puppetclasses page linked to from the host page

fixes #1825 - unable to select an openstack image.

Note that probably Fog 1.5 is required for this to work.

Fixed typo in the word 'associations'

The new form should save 'New compute resource'

fixes #1840 Only show the help button if a help page exists

refs #1843 normally facts base hash has no certname.

this will make sure we don't fetch the wrong host (without a certname) by mistake.

fixes #1849 - Add the current hostgroup name when editing